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AT45DB321B-CI
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P27
P28-P30
P31-P32
16
AT45DB321B
2223D
–DFLASH
–10/02
Write O
perations
The following b
lock diagram and wave
forms illustrate the
various write sequence
s
availab
le.
Main Memory P
age Program thr
ough Buf
fer
s
Buffer Write
Buffer to Main Memory Pa
ge Program (Data from Buff
er Programmed into Flash P
ag
e)
FLASH MEMORY ARRAY
PAGE (528 BYTES)
BUFFER 2 (528 BYTES)
BUFFER 1 (528 BYTES)
I/O INTERFACE
SI
BUFFER 1 TO
MAIN MEMORY
PAGE PROGRAM
MAIN MEMORY
PAGE PROGRAM
THROUGH BUFFER 2
BUFFER 2 TO
MAIN MEMORY
PAGE PROGRAM
MAIN MEMORY PAGE
PROGRAM THROUGH
BUFFER 1
BUFFER 1
WRITE
BUFFER 2
WRITE
SI
CMD
n
n+1
Last Byte
· Completes writing into selected buffer
· Starts self-timed erase/program operation
CS
r
, PA12-6
PA5-0, BFA9-8
BFA7-0
SI
CMD
X
X···X, BFA9-8
BFA7-0
n
n+1
Last Byte
· Completes writing into selected buffer
CS
SI
CMD
PA5-0, XX
X
CS
Starts self-timed erase/program operation
r
, PA12-6
Each transition represents
8 bits and 8 clock cycles
n = 1st b
yte read
n+1 = 2nd
b
yte read
17
AT45DB321B
2223D–
DFLASH–
10/02
Read Operations
The following block diagram and waveforms illustrate the various read sequences
availab
le.
Main
Memo
ry
P
age
Read
Main Mem
ory
P
ag
e to Buffer T
r
ansfer (Data
from
Flash Page Read into Buf
fer)
Buffer Read
FLASH MEMORY ARRAY
PAGE (528 BYTES)
BUFFER 2 (528 BYTES)
BUFFER 1 (528 BYTES)
I/O INTERFACE
MAIN MEMORY
PAGE TO
BUFFER 1
MAIN MEMORY
PAGE TO
BUFFER 2
MAIN MEMORY
PAGE READ
BUFFER 1
READ
BUFFER 2
READ
SO
SI
CMD
PA5-0, BA9-8
BA7-0
X
XXX
CS
n
n+1
SO
r
, PA12-6
SI
CMD
PA5-0, XX
X
Starts reading page data into buffer
CS
SO
r
, PA12-6
SI
CMD
X
X···X, BFA9-8
BFA7-0
CS
n
n+1
SO
X
E
ach transition represents
8 bits and 8 clock cycles
n = 1st b
yte read
n+1 = 2nd
b
yte read
18
AT45DB321B
2223D
–DFLASH
–10/02
Detailed Bit-le
vel Read Timi
ng – Inacti
ve Cloc
k P
olarity Lo
w
Continuous Arra
y Re
ad (Opcode: 68H)
Main Memor
y P
age Read (Opcode
: 52H)
SI
0
1X
X
CS
SO
SCK
12
63
64
65
66
67
68
HIGH-IMPEDANCE
D
7
D
6
D
5
D
2
D
1
D
0
D
7
D
6
D
5
DATA OUT
BIT 0
OF
PAGE n+1
BIT 4223
OF
PAGE n
LSB
MSB
t
SU
t
V
SI
0
1
0
10
XXX
CS
SO
SCK
12345
60
61
62
63
64
65
66
67
XX
HIGH-IMPEDANCE
D
7
D
6
D
5
DATA OUT
COMMAND OPCODE
MSB
t
SU
t
V
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P27
P28-P30
P31-P32
AT45DB321B-CI
Mfr. #:
Buy AT45DB321B-CI
Manufacturer:
Description:
IC FLASH 32M SPI 20MHZ 44CBGA
Lifecycle:
New from this manufacturer.
Delivery:
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